First observation of radiative B0→·K0γ decays and measurements of their time-dependent CP violation

H. Sahoo, T. E. Browder, I. Adachi, D. M. Asner, V. Aulchenko, A. M. Bakich, E. Barberio, K. Belous, V. Bhardwaj, B. Bhuyan, A. Bondar, A. Bozek, M. Bračko, O. Brovchenko, A. Chen, P. Chen, B. G. Cheon, K. Cho, Y. Choi, J. Dalseno & 137 others Z. Doleal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, V. Gaur, N. Gabyshev, J. Haba, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, N. J. Joshi, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, S. Koblitz, P. Kody, S. Korpar, P. Krian, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. J. Kwon, J. S. Lange, M. J. Lee, S. H. Lee, J. Li, Y. Li, J. Libby, C. L. Lim, Z. Q. Liu, D. Liventsev, R. Louvot, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, T. Mori, M. Nakao, Z. Natkaniec, C. Ng, S. Nishida, K. Nishimura, O. Nitoh, T. Nozaki, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, C. W. Park, H. K. Park, T. Peng, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Prim, M. Röhrken, S. Ryu, K. Sakai, Y. Sakai, T. Sanuki, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, T. A. Shibata, J. G. Shiu, B. Shwartz, F. Simon, P. Smerkol, Y. S. Sohn, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, M. Sumihama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, G. Varner, A. Vinokurova, M. Watanabe, Y. Watanabe, K. M. Williams, Eunil Won, B. D. Yabsley, Y. Yamashita, C. Z. Yuan, Y. Yusa, C. C. Zhang, Z. P. Zhang, V. Zhilich, P. Zhou, V. Zhulanov, A. Zupanc

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We report the first observation of the radiative decay B0→· K0γ using a data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal of 37±8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B0→·K0γ)= (2.74±0.60±0.32)×10-6, where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters: S ·KS0γ=+0.74-1.05+0.72(stat)-0.24+0.10(syst) and A ·KS0γ=+0.35±0.58(stat)-0.10+0.23(syst). Furthermore, we measure B(B+→·K+γ)=(2. 48±0.30±0.24)×10-6, ACP=-0. 03±0.11±0.08, and find that the signal is concentrated in the M·K mass region near threshold.

Original languageEnglish
Article number071101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume84
Issue number7
DOIs
Publication statusPublished - 2011 Oct 6

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CP violation
decay
standard deviation
thresholds
detectors
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

First observation of radiative B0→·K0γ decays and measurements of their time-dependent CP violation. / Sahoo, H.; Browder, T. E.; Adachi, I.; Asner, D. M.; Aulchenko, V.; Bakich, A. M.; Barberio, E.; Belous, K.; Bhardwaj, V.; Bhuyan, B.; Bondar, A.; Bozek, A.; Bračko, M.; Brovchenko, O.; Chen, A.; Chen, P.; Cheon, B. G.; Cho, K.; Choi, Y.; Dalseno, J.; Doleal, Z.; Drásal, Z.; Eidelman, S.; Epifanov, D.; Fast, J. E.; Gaur, V.; Gabyshev, N.; Haba, J.; Hayasaka, K.; Hayashii, H.; Horii, Y.; Hoshi, Y.; Hou, W. S.; Hsiung, Y. B.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwabuchi, M.; Iwasaki, Y.; Iwashita, T.; Joshi, N. J.; Julius, T.; Kang, J. H.; Kawasaki, T.; Kiesling, C.; Kim, H. J.; Kim, H. O.; Kim, J. B.; Kim, J. H.; Kim, K. T.; Kim, M. J.; Kim, S. K.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Kobayashi, N.; Koblitz, S.; Kody, P.; Korpar, S.; Krian, P.; Kuhr, T.; Kumar, R.; Kumita, T.; Kuzmin, A.; Kwon, Y. J.; Lange, J. S.; Lee, M. J.; Lee, S. H.; Li, J.; Li, Y.; Libby, J.; Lim, C. L.; Liu, Z. Q.; Liventsev, D.; Louvot, R.; Matvienko, D.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Mohanty, G. B.; Mori, T.; Nakao, M.; Natkaniec, Z.; Ng, C.; Nishida, S.; Nishimura, K.; Nitoh, O.; Nozaki, T.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H. K.; Peng, T.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Prim, M.; Röhrken, M.; Ryu, S.; Sakai, K.; Sakai, Y.; Sanuki, T.; Schneider, O.; Schwanda, C.; Schwartz, A. J.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shibata, T. A.; Shiu, J. G.; Shwartz, B.; Simon, F.; Smerkol, P.; Sohn, Y. S.; Sokolov, A.; Solovieva, E.; Stanič, S.; Starič, M.; Sumihama, M.; Sumisawa, K.; Sumiyoshi, T.; Suzuki, S.; Tatishvili, G.; Teramoto, Y.; Trabelsi, K.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Ushiroda, Y.; Vahsen, S. E.; Varner, G.; Vinokurova, A.; Watanabe, M.; Watanabe, Y.; Williams, K. M.; Won, Eunil; Yabsley, B. D.; Yamashita, Y.; Yuan, C. Z.; Yusa, Y.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhou, P.; Zhulanov, V.; Zupanc, A.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 84, No. 7, 071101, 06.10.2011.

Research output: Contribution to journalArticle

Sahoo, H, Browder, TE, Adachi, I, Asner, DM, Aulchenko, V, Bakich, AM, Barberio, E, Belous, K, Bhardwaj, V, Bhuyan, B, Bondar, A, Bozek, A, Bračko, M, Brovchenko, O, Chen, A, Chen, P, Cheon, BG, Cho, K, Choi, Y, Dalseno, J, Doleal, Z, Drásal, Z, Eidelman, S, Epifanov, D, Fast, JE, Gaur, V, Gabyshev, N, Haba, J, Hayasaka, K, Hayashii, H, Horii, Y, Hoshi, Y, Hou, WS, Hsiung, YB, Hyun, HJ, Iijima, T, Inami, K, Ishikawa, A, Itoh, R, Iwabuchi, M, Iwasaki, Y, Iwashita, T, Joshi, NJ, Julius, T, Kang, JH, Kawasaki, T, Kiesling, C, Kim, HJ, Kim, HO, Kim, JB, Kim, JH, Kim, KT, Kim, MJ, Kim, SK, Kim, YJ, Kinoshita, K, Ko, BR, Kobayashi, N, Koblitz, S, Kody, P, Korpar, S, Krian, P, Kuhr, T, Kumar, R, Kumita, T, Kuzmin, A, Kwon, YJ, Lange, JS, Lee, MJ, Lee, SH, Li, J, Li, Y, Libby, J, Lim, CL, Liu, ZQ, Liventsev, D, Louvot, R, Matvienko, D, McOnie, S, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mizuk, R, Mohanty, GB, Mori, T, Nakao, M, Natkaniec, Z, Ng, C, Nishida, S, Nishimura, K, Nitoh, O, Nozaki, T, Ohshima, T, Okuno, S, Olsen, SL, Onuki, Y, Pakhlov, P, Pakhlova, G, Park, CW, Park, HK, Peng, T, Pestotnik, R, Petrič, M, Piilonen, LE, Prim, M, Röhrken, M, Ryu, S, Sakai, K, Sakai, Y, Sanuki, T, Schneider, O, Schwanda, C, Schwartz, AJ, Senyo, K, Seon, O, Sevior, ME, Shapkin, M, Shebalin, V, Shibata, TA, Shiu, JG, Shwartz, B, Simon, F, Smerkol, P, Sohn, YS, Sokolov, A, Solovieva, E, Stanič, S, Starič, M, Sumihama, M, Sumisawa, K, Sumiyoshi, T, Suzuki, S, Tatishvili, G, Teramoto, Y, Trabelsi, K, Uchida, M, Uglov, T, Unno, Y, Uno, S, Ushiroda, Y, Vahsen, SE, Varner, G, Vinokurova, A, Watanabe, M, Watanabe, Y, Williams, KM, Won, E, Yabsley, BD, Yamashita, Y, Yuan, CZ, Yusa, Y, Zhang, CC, Zhang, ZP, Zhilich, V, Zhou, P, Zhulanov, V & Zupanc, A 2011, 'First observation of radiative B0→·K0γ decays and measurements of their time-dependent CP violation', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 84, no. 7, 071101. https://doi.org/10.1103/PhysRevD.84.071101
Sahoo, H. ; Browder, T. E. ; Adachi, I. ; Asner, D. M. ; Aulchenko, V. ; Bakich, A. M. ; Barberio, E. ; Belous, K. ; Bhardwaj, V. ; Bhuyan, B. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Brovchenko, O. ; Chen, A. ; Chen, P. ; Cheon, B. G. ; Cho, K. ; Choi, Y. ; Dalseno, J. ; Doleal, Z. ; Drásal, Z. ; Eidelman, S. ; Epifanov, D. ; Fast, J. E. ; Gaur, V. ; Gabyshev, N. ; Haba, J. ; Hayasaka, K. ; Hayashii, H. ; Horii, Y. ; Hoshi, Y. ; Hou, W. S. ; Hsiung, Y. B. ; Hyun, H. J. ; Iijima, T. ; Inami, K. ; Ishikawa, A. ; Itoh, R. ; Iwabuchi, M. ; Iwasaki, Y. ; Iwashita, T. ; Joshi, N. J. ; Julius, T. ; Kang, J. H. ; Kawasaki, T. ; Kiesling, C. ; Kim, H. J. ; Kim, H. O. ; Kim, J. B. ; Kim, J. H. ; Kim, K. T. ; Kim, M. J. ; Kim, S. K. ; Kim, Y. J. ; Kinoshita, K. ; Ko, B. R. ; Kobayashi, N. ; Koblitz, S. ; Kody, P. ; Korpar, S. ; Krian, P. ; Kuhr, T. ; Kumar, R. ; Kumita, T. ; Kuzmin, A. ; Kwon, Y. J. ; Lange, J. S. ; Lee, M. J. ; Lee, S. H. ; Li, J. ; Li, Y. ; Libby, J. ; Lim, C. L. ; Liu, Z. Q. ; Liventsev, D. ; Louvot, R. ; Matvienko, D. ; McOnie, S. ; Miyabayashi, K. ; Miyata, H. ; Miyazaki, Y. ; Mizuk, R. ; Mohanty, G. B. ; Mori, T. ; Nakao, M. ; Natkaniec, Z. ; Ng, C. ; Nishida, S. ; Nishimura, K. ; Nitoh, O. ; Nozaki, T. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Onuki, Y. ; Pakhlov, P. ; Pakhlova, G. ; Park, C. W. ; Park, H. K. ; Peng, T. ; Pestotnik, R. ; Petrič, M. ; Piilonen, L. E. ; Prim, M. ; Röhrken, M. ; Ryu, S. ; Sakai, K. ; Sakai, Y. ; Sanuki, T. ; Schneider, O. ; Schwanda, C. ; Schwartz, A. J. ; Senyo, K. ; Seon, O. ; Sevior, M. E. ; Shapkin, M. ; Shebalin, V. ; Shibata, T. A. ; Shiu, J. G. ; Shwartz, B. ; Simon, F. ; Smerkol, P. ; Sohn, Y. S. ; Sokolov, A. ; Solovieva, E. ; Stanič, S. ; Starič, M. ; Sumihama, M. ; Sumisawa, K. ; Sumiyoshi, T. ; Suzuki, S. ; Tatishvili, G. ; Teramoto, Y. ; Trabelsi, K. ; Uchida, M. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Ushiroda, Y. ; Vahsen, S. E. ; Varner, G. ; Vinokurova, A. ; Watanabe, M. ; Watanabe, Y. ; Williams, K. M. ; Won, Eunil ; Yabsley, B. D. ; Yamashita, Y. ; Yuan, C. Z. ; Yusa, Y. ; Zhang, C. C. ; Zhang, Z. P. ; Zhilich, V. ; Zhou, P. ; Zhulanov, V. ; Zupanc, A. / First observation of radiative B0→·K0γ decays and measurements of their time-dependent CP violation. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2011 ; Vol. 84, No. 7.
@article{8cdd89176e1b4c4195c809ec4151b0c0,
title = "First observation of radiative B0→·K0γ decays and measurements of their time-dependent CP violation",
abstract = "We report the first observation of the radiative decay B0→· K0γ using a data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal of 37±8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B0→·K0γ)= (2.74±0.60±0.32)×10-6, where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters: S ·KS0γ=+0.74-1.05+0.72(stat)-0.24+0.10(syst) and A ·KS0γ=+0.35±0.58(stat)-0.10+0.23(syst). Furthermore, we measure B(B+→·K+γ)=(2. 48±0.30±0.24)×10-6, ACP=-0. 03±0.11±0.08, and find that the signal is concentrated in the M·K mass region near threshold.",
author = "H. Sahoo and Browder, {T. E.} and I. Adachi and Asner, {D. M.} and V. Aulchenko and Bakich, {A. M.} and E. Barberio and K. Belous and V. Bhardwaj and B. Bhuyan and A. Bondar and A. Bozek and M. Bračko and O. Brovchenko and A. Chen and P. Chen and Cheon, {B. G.} and K. Cho and Y. Choi and J. Dalseno and Z. Doleal and Z. Dr{\'a}sal and S. Eidelman and D. Epifanov and Fast, {J. E.} and V. Gaur and N. Gabyshev and J. Haba and K. Hayasaka and H. Hayashii and Y. Horii and Y. Hoshi and Hou, {W. S.} and Hsiung, {Y. B.} and Hyun, {H. J.} and T. Iijima and K. Inami and A. Ishikawa and R. Itoh and M. Iwabuchi and Y. Iwasaki and T. Iwashita and Joshi, {N. J.} and T. Julius and Kang, {J. H.} and T. Kawasaki and C. Kiesling and Kim, {H. J.} and Kim, {H. O.} and Kim, {J. B.} and Kim, {J. H.} and Kim, {K. T.} and Kim, {M. J.} and Kim, {S. K.} and Kim, {Y. J.} and K. Kinoshita and Ko, {B. R.} and N. Kobayashi and S. Koblitz and P. Kody and S. Korpar and P. Krian and T. Kuhr and R. Kumar and T. Kumita and A. Kuzmin and Kwon, {Y. J.} and Lange, {J. S.} and Lee, {M. J.} and Lee, {S. H.} and J. Li and Y. Li and J. Libby and Lim, {C. L.} and Liu, {Z. Q.} and D. Liventsev and R. Louvot and D. Matvienko and S. McOnie and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and Mohanty, {G. B.} and T. Mori and M. Nakao and Z. Natkaniec and C. Ng and S. Nishida and K. Nishimura and O. Nitoh and T. Nozaki and T. Ohshima and S. Okuno and Olsen, {S. L.} and Y. Onuki and P. Pakhlov and G. Pakhlova and Park, {C. W.} and Park, {H. K.} and T. Peng and R. Pestotnik and M. Petrič and Piilonen, {L. E.} and M. Prim and M. R{\"o}hrken and S. Ryu and K. Sakai and Y. Sakai and T. Sanuki and O. Schneider and C. Schwanda and Schwartz, {A. J.} and K. Senyo and O. Seon and Sevior, {M. E.} and M. Shapkin and V. Shebalin and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and F. Simon and P. Smerkol and Sohn, {Y. S.} and A. Sokolov and E. Solovieva and S. Stanič and M. Starič and M. Sumihama and K. Sumisawa and T. Sumiyoshi and S. Suzuki and G. Tatishvili and Y. Teramoto and K. Trabelsi and M. Uchida and T. Uglov and Y. Unno and S. Uno and Y. Ushiroda and Vahsen, {S. E.} and G. Varner and A. Vinokurova and M. Watanabe and Y. Watanabe and Williams, {K. M.} and Eunil Won and Yabsley, {B. D.} and Y. Yamashita and Yuan, {C. Z.} and Y. Yusa and Zhang, {C. C.} and Zhang, {Z. P.} and V. Zhilich and P. Zhou and V. Zhulanov and A. Zupanc",
year = "2011",
month = "10",
day = "6",
doi = "10.1103/PhysRevD.84.071101",
language = "English",
volume = "84",
journal = "Physical review D: Particles and fields",
issn = "0556-2821",
publisher = "American Institute of Physics Publising LLC",
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}

TY - JOUR

T1 - First observation of radiative B0→·K0γ decays and measurements of their time-dependent CP violation

AU - Sahoo, H.

AU - Browder, T. E.

AU - Adachi, I.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Bakich, A. M.

AU - Barberio, E.

AU - Belous, K.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Brovchenko, O.

AU - Chen, A.

AU - Chen, P.

AU - Cheon, B. G.

AU - Cho, K.

AU - Choi, Y.

AU - Dalseno, J.

AU - Doleal, Z.

AU - Drásal, Z.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Horii, Y.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwabuchi, M.

AU - Iwasaki, Y.

AU - Iwashita, T.

AU - Joshi, N. J.

AU - Julius, T.

AU - Kang, J. H.

AU - Kawasaki, T.

AU - Kiesling, C.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kim, J. B.

AU - Kim, J. H.

AU - Kim, K. T.

AU - Kim, M. J.

AU - Kim, S. K.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Ko, B. R.

AU - Kobayashi, N.

AU - Koblitz, S.

AU - Kody, P.

AU - Korpar, S.

AU - Krian, P.

AU - Kuhr, T.

AU - Kumar, R.

AU - Kumita, T.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lange, J. S.

AU - Lee, M. J.

AU - Lee, S. H.

AU - Li, J.

AU - Li, Y.

AU - Libby, J.

AU - Lim, C. L.

AU - Liu, Z. Q.

AU - Liventsev, D.

AU - Louvot, R.

AU - Matvienko, D.

AU - McOnie, S.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Mori, T.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Ng, C.

AU - Nishida, S.

AU - Nishimura, K.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H. K.

AU - Peng, T.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - Prim, M.

AU - Röhrken, M.

AU - Ryu, S.

AU - Sakai, K.

AU - Sakai, Y.

AU - Sanuki, T.

AU - Schneider, O.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Seon, O.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shebalin, V.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Simon, F.

AU - Smerkol, P.

AU - Sohn, Y. S.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Stanič, S.

AU - Starič, M.

AU - Sumihama, M.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Suzuki, S.

AU - Tatishvili, G.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Uchida, M.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Ushiroda, Y.

AU - Vahsen, S. E.

AU - Varner, G.

AU - Vinokurova, A.

AU - Watanabe, M.

AU - Watanabe, Y.

AU - Williams, K. M.

AU - Won, Eunil

AU - Yabsley, B. D.

AU - Yamashita, Y.

AU - Yuan, C. Z.

AU - Yusa, Y.

AU - Zhang, C. C.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhou, P.

AU - Zhulanov, V.

AU - Zupanc, A.

PY - 2011/10/6

Y1 - 2011/10/6

N2 - We report the first observation of the radiative decay B0→· K0γ using a data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal of 37±8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B0→·K0γ)= (2.74±0.60±0.32)×10-6, where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters: S ·KS0γ=+0.74-1.05+0.72(stat)-0.24+0.10(syst) and A ·KS0γ=+0.35±0.58(stat)-0.10+0.23(syst). Furthermore, we measure B(B+→·K+γ)=(2. 48±0.30±0.24)×10-6, ACP=-0. 03±0.11±0.08, and find that the signal is concentrated in the M·K mass region near threshold.

AB - We report the first observation of the radiative decay B0→· K0γ using a data sample of 772×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal of 37±8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is B(B0→·K0γ)= (2.74±0.60±0.32)×10-6, where the uncertainties are statistical and systematic, respectively. We also report the first measurements of time-dependent CP-violation parameters: S ·KS0γ=+0.74-1.05+0.72(stat)-0.24+0.10(syst) and A ·KS0γ=+0.35±0.58(stat)-0.10+0.23(syst). Furthermore, we measure B(B+→·K+γ)=(2. 48±0.30±0.24)×10-6, ACP=-0. 03±0.11±0.08, and find that the signal is concentrated in the M·K mass region near threshold.

UR - http://www.scopus.com/inward/record.url?scp=80555136717&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80555136717&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.84.071101

DO - 10.1103/PhysRevD.84.071101

M3 - Article

VL - 84

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 7

M1 - 071101

ER -